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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6530e375207795df24fc68f35e338ad1b8cd3c6dc24ed373a76e7c9ac78eec' 
  AND token = 'Z/aXcTunXRfkHRJ+TpRBxnSI2A/lk0zg4qqeud0FZpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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