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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d577f9ad6393de7285fe5bb0e201d7f208e1db2ff8e686bdb8cdcc2abcd727' 
  AND token = '+LrrGPun82cbJCHmrActm2w+O1EUphuJ2c/qlxEaNxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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