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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c58ed309878786678b2669566812ae3d0aa1abff75610b99e1491d435964106' 
  AND token = 'i7FPsKCcahIOrCaTiwr4D7DaMoXI2i8dJKxtEZv24Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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