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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372dbeaed06b3eccdc4c5cfdd14655e47e7ed88d50da236605a7d8ec22ffd8c6' 
  AND token = '/QYLm6jxCoSMmd/DXzQ7VPTyVwy0CTe7wIqjAF1efFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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