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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece79a899d2a5516d7f1cbe2e132ea479a103b1b820cbd3e99e6f1eb5c5973d6' 
  AND token = 'QwCQ7+vNWT9R7kV/1R9JskdAU0ry/pI0GIW2t8RQIms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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