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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e58fe36b850fc9d2fbb889b0ad1106c6246b2996f3e1219f9f89b6b00ab79c' 
  AND token = 'Jc85LkhaOllV9ugCVbiMhixPkt/DCExrs5IwezNwxjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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