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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fc95f607dea410625226e874fd60170dd85657b3c9adc5fc70469386a5f0e0' 
  AND token = 'GeDiwG0ZKmMEro6VDTSAbNSkkLTFf/Zn4vg65or+MTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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