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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1940d00e9f5762d069d79d60e32583c35e7db926500d52ca9e71c74c601b8a32' 
  AND token = 'I6FRZSwQoEmin0y8rItrfN5MoDPS3P1hpvLoCj/fZlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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