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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41163b3c9a95f33d0836b10d90282b869b29585650d7c4f112c2e6888021346' 
  AND token = '3SS2qxZb4OEKN6ElVSPd2qN1+LH4pmud0X6pjqxsVg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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