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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f2db8b6fa4d9123c3dc01d107e0a4e92c1ec7907103ad832a5b86eb9951d2e' 
  AND token = '1gn/KZ1qdg4wyZt9s7qqRHEmx5fy+HsZXtEu3g3w2Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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