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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc06a9f61446ff3457e8f7c068f767988ff1da8aa09e91ff3b45f731a5a7daf9' 
  AND token = 'XE4J76wq1blvqBvP7/IEyV9UVj+9mNkpOw9nwIYKoWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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