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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14a5a210aae2c81ce320fd0eb77bf39269561934f41dcb803ec9f8ef60e9998' 
  AND token = 'ZqP+4l5CnnJKQIpHdA9DmtQH1xtD7FSx70jT2JWuyoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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