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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c455777e3a6b0da61eff6bcebd82382741c63cd7bcce8d4cd3a4eaea47ad2be' 
  AND token = '3HkfrCT4wA1GIne2RcUtpUeo7d7ScYUWZS/BOGVdQIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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