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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02806b0ebc2f13c4e70996d5301cc7692c9b7448368c1c3efe32f1e97458035' 
  AND token = 't2z+q5AHAKFLImVblGUSW1IaT4cuYgfMlRRXk2ZcRZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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