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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48227209cd20aa7cae2fa7d83a436f9e7579a9e09a934fc2dcc1ea0f13fb788' 
  AND token = 'Yq38BEIbVJzHn/vfFa31RZ59ZI19kzNWxu1nx+0rxVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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