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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e9ac6e22ccfc740121d06ab01e9cbf5432b0232cf8e95d3d3ec5114dcc9f95' 
  AND token = 'EwcjYSg0YzBANewc7+cnD3vD8u40buyT5OoqbS+Wxb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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