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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da51e5d0e92407a6fb49cb04de2a1bb8d5367e266049d46da5aae1a8dbaf7c84' 
  AND token = '66VWV7J3nM8suMD81zbtYW6aOu5OkTX3BXS+SknkqKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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