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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c69e360fffa32c039474684dd01d2985b7db6f3323ba3b4f231e01a26d32ed' 
  AND token = 'yeXfj5ZIf7wKDJmsFOk0rYEr84dy3t9kqvLRPcWnDFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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