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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb1c18edc4cb6ceb037a8bc3be84b6690b1d033f45912841dbff759eb5d64e6' 
  AND token = 'uBpEfDFr5cdH5v1y4/cGYwB5b5lt5Z1DYSB5OBg1h0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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