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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a2692c46ec8550bc82853d82c38a7e931a456495f6e55b670d3473d2108a1b' 
  AND token = 'su1uDR4a1bWxaINDtgwGeZh0yAZhz/5WtJWG0iHaKmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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