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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5f4b5a52d702efa3f1d71ff1a9b57fbcfa0b8997c88212f56f53bb5ddea5f2' 
  AND token = 'R1IEskIAeaBOTc3LAxGTfCy6Rz2G5ZNI7IGTq0h9QJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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