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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a05daf911aa54df9e15d42c6635a8ef0a922a5c192d6749e2df9cdb629da071' 
  AND token = '/BkJ41JIcXCmB4dOV6CnQheCDBsUjYmo39+nolOdmkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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