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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c3f3af043b4d273f57c5890b01d5bdb684192c77d01dc3f8f58d94acbd1ca8' 
  AND token = 'I2KHa4R36Vaegs4XVpl1Ga52nONaf+CodNM56C5/rX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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