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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c47aec9d7b18e44ee8cd4ce3dfc6e829c50211df2246bba6f4c9597086984f' 
  AND token = 'a1EclHBExrMAeCX2k4MVzSt40xtASdU39gbQZwPagRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}