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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed01ca4241e6e6b0284fea599ceffa1d061e4ecc5158c4d90fc6eb7bc633d8b' 
  AND token = 't+CVQrYD5ITgTRg2y7UtAFhrmoD1pCUCsqQZqkoNYl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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