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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62033e392b7a6394e3703ff22688933e1df191061a3ba7d52cd4d3cd6edc747e' 
  AND token = '6MQ8DZH1n3PKmWDyZr4u/q9gbvzk+vxC06nIK9Wc/YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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