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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefa8ed6b23ab20eb65bee83af5bde604c5424e64404dbeb4d3eddefd1478278' 
  AND token = '/hs9E6ZlswDsVz2O9lo/yfVsrZLnaAIUyoGWn61gqJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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