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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96835ecdc945cb3ea2e4829246fa2c7e94bff465736c0f1d2c618a5e9f86488b' 
  AND token = 'mX9MjvlAdsPp49qnP+d8oab/kx2MhGQOoRyig3jl9hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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