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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97cbfda56fa4cf2d8433d3ed8127c4fe2638be606b31c2c2bc1a946d3a10314' 
  AND token = 'D8IS8ktLYzh4e5sf0Z3QK6hUYUBoNGDEuVtpeW/RpB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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