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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1ffc58840a7409eafe3bbf7ed29450d8d6a4fbef03a957cc5aae271d9b3feb' 
  AND token = 'JxNfF8N26d3x/1a57cFQ/VCX27Ig914K3xhsyVCVr1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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