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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a055c7972ac907f9694deffff472bc0fa7bf3e63358d29629912fe1665ff5be5' 
  AND token = '9fC28UyMQP7Puqi/eCzp2pUWHfjCcnBM4T7cxdmaJT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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