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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc410962ca42570f3cab77d6724a7eac00a9641eec4711a0e88479783f79d3b' 
  AND token = 'cVeY2/ki5Sxq8N7+vgUgHELGVoMGlBNcGpFPrTqbuck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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