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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b3d7f8aa3daef9e4cc5b914feac7f9f062f910730253e3e1c018248f01871b' 
  AND token = '7NjtgEbjwJ9x3fFMv/nZJX5PsFBnaoK/E9MOBY586mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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