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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fd5b8deabca063123313dd0ad74e65ee750504c54d9f54c04c8b1f8bf4bb8a' 
  AND token = 'zHJ9abeSuJik78ec032Sb6TWEzhz8c73Clm33Pm1caw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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