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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a6b03b1a317446de080c7c3d980491dab9b4b960cdd27216d53d3e679c12e9' 
  AND token = 'Wztzfuz2e7xFvhhjk8+22N/9B548s810EB6y4UXG+YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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