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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5691cf6c0c80fdaaf701eadbd2f3a23d086a3cc6b306a5f4e36403e9e53b90d8' 
  AND token = 'mZxfJL2he0FyWVWS+ACEztqn/QnmXijMMUDrjSoJdLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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