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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbb19c4d9a9419ce8446ddb2b604b236a4001d39756ef4e625fbed3b70b2bbb' 
  AND token = 'StjeB9/LPrETlDlP3JVJJO9JlYH9ODbZh+GKkqH7b1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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