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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad32c66d62e3d0a8ba6c388a5f6ecdef71bb5384f1c0f250da10fbeb513fdbc' 
  AND token = '/ajiwEbzwCou4t1pUCfBOFHO+mB4tJhfjB3mJqY+1+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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