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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40153e35c640d1113902080f3e4477f2d77bd1bd13cb3bbce592c0d1d56a386' 
  AND token = 'GDMNINHnEQEZe8JcXiPvEHE9VAHhTgoS5tOJpBgP46s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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