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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7411f7efe03c34df37351876f98bcb72ae99bbef2ddc89957d7571c52b51c0cb' 
  AND token = '58Y0pFuWPBXpYYPW6zP67QQFgWjibtUHs74Bq0+rteA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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