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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4feeb0dacc35d6e5051b59ada1a39449128c8ab2839d533daa855b2c956475d' 
  AND token = 'leTk5bggSpolJfyTeq65z1rY8xua7BeHjdT8Xh5NvMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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