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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97a5f303402b4f047e73054646a1c51a8a627598dcc666f35cb4b9933fa8e50' 
  AND token = 'IZWe4Gp259VcJx5tt3jE0tvAQ4ci5si9S4WPpPAze/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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