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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e62b485870c960d9ca74a158f76f7643cdfe2f396f3479f65ba443c7d96bc7f' 
  AND token = 'HMfi698zS96ucT5w3QJuYBH9AU2Pwf8eZUjxO5PUWlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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