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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1faa8782fe1ecbf84808f3fc97f5a05904efcbce200492b4a7b8afa41e6437' 
  AND token = '+YjOaNhae7R9LRNS8fLc7nTZMG3NEKkf8V1WFiM/DmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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