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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd2f893810da79d580a245f02a16c4617dc85915859ec9d43aea14964632e39' 
  AND token = 'oa2aF9aezetsPyj/IrWFVXMSK91HsLZn8NMOaqJemdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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