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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52cc2d55307571f34b881c118d3579afe7d3b8e439ae9c2739a0082bab3f477' 
  AND token = 'jmsuEUXKgN6Kt/ekSor7opHWCcCXfdk4FGa7vNWwuNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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