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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1e9ac91a229eb64432bc41aa433bf3fc46d1dd103abe9730407b03f64ddbd1' 
  AND token = 'v/SGaozpKp4QqmeSedsG2v1GpbZaStTWbrpzFfHdiNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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