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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b8a45a7fd155e01957899e6e799b5feca3ba05bd9f79d49abdb5b0284f9261' 
  AND token = '1iOdKc1q+zUBJJF5JZoC3uV6UYJn7QrOLVqu09Opa0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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