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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809e14437d6ef5484290da7ab770dac8c78b07588781a7ca0c68da6381351fb4' 
  AND token = '6a9n0WWNCZJ81L2X7b1QhkD6fa9H2mHphiV8/YwtLL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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