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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a675b2a651b53d2042558b63e576b692ef2c3ebc8dc2af88c8858f8a9e97bf20' 
  AND token = '6SJ8CgNRQFl1lXb3J2azit6SCejgQzjSEGN9tNnBbRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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