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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd968aa18fff920301a1d0c91d011a5dca2d0f470c37729749a5cf2ed93d100e3' 
  AND token = 'DX6b5AxkI+u0SyC8h5q7e3389tgpm5PtxwowzuAraGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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