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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60639e59b90be3ca610d2ac435f3e21545a255836b55b6b9c04be23c27ad6330' 
  AND token = '17pPYQH+9/2xeVBoKkCqe4IBcULs+Q5ZHD0orZF4oUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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