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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced6b781bede44a8f5ac6dbddd94a117aea7c8dc4f7bf3f826b2792ea506bc19' 
  AND token = 'cSaQQYC3e4/+/2YgBOBh3beCrQoVbekxnct4/QtOcXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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