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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bda0b5a72f064add6f987570eef3009316e5bcd6989f65fa837d3ceb342dd82' 
  AND token = 'rHcqwEfMX37nHAYpWnlYjqNo2E3n+kpk+OvyO6HZlYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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