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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea7d297aacc721b2d17080c74bab200598b1b4a499e3f8566e66b11b8993112' 
  AND token = '4HILMcijP32qlNcCEA4otbDGAftkVzk6uUNq6RqLg40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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