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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ae8ab192eec7dcd77b5cfc3c056c11a4af04fa5799a35701577878039b91b9' 
  AND token = 'J/zmoNlIvK/30BB3k5U1qe8f2PxTLZcyb2lTOFezQtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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