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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecb3d4a4984db29bf1c737785977d26c9ebb3431858237131f2cd803367bfaa' 
  AND token = 'ncsCscHTWKwSRbgOX/WQCkIFtUJOO8K3jQr2e14oePY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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